/* Direction C, round 3: lines drawn from the logos.
   Hero: a field of fine horizontal lines. On the right the lines turn colored to form the Strata mark (three offset bars).
   Layers: the four layers take the shape of the Mesa mark (a stepped stack that widens toward the base).
   Layer colors carry through the page: Mesa agents = mahogany, Warden = sky, Slate = sky light, Tessera = stone. */

.xc { background: var(--surface); color: var(--ink); font-family: var(--font-sans); }
.xc-wrap { max-width: var(--container-wide); margin: 0 auto; padding: 0 var(--page-margin); }
.xc-sec { padding: var(--space-9) 0; }
.xc-sec--canvas { background: var(--canvas); }
.xc-k { margin: 0; color: var(--accent); font: 600 12px/16px var(--font-sans); letter-spacing: 0.14em; text-transform: uppercase; }
.xc-h2 { margin: var(--space-3) 0 0; color: var(--ink); text-wrap: balance; }
.xc-p { margin: var(--space-4) 0 0; color: var(--ink-secondary); text-wrap: pretty; }
.xc-head { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); align-items: end; }
.xc-head > div { grid-column: 1 / span 7; }
.xc-head > p { grid-column: 9 / span 4; margin: 0; color: var(--ink-secondary); text-wrap: pretty; }
.xc-fade { opacity: 0; animation: xc-in 900ms var(--ease-settle) forwards; animation-delay: var(--d, 0ms); }
.xc-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: var(--space-6); }

/* Line field (background hairlines) */
.xc-bg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; -webkit-mask-image: linear-gradient(to right, transparent 0%, #000 55%); mask-image: linear-gradient(to right, transparent 0%, #000 55%); }
.xc-bg path { fill: none; stroke: var(--hairline); stroke-width: 1; vector-effect: non-scaling-stroke; }
.xc-ink .xc-bg path { stroke: color-mix(in srgb, var(--on-ink) 10%, transparent); }
.xc-ink .xc-bg__accent { stroke: var(--brand-rose); opacity: 0.7; }

/* The Strata mark, drawn in lines */
.xc-mark { position: absolute; top: 50%; right: -140px; width: 900px; height: 640px; transform: translateY(-50%); overflow: visible; pointer-events: none; }
.xc-bar path { fill: none; stroke-width: 1.4; stroke-linecap: round; vector-effect: non-scaling-stroke; }
.xc-bar__tint { stroke: none; }
.xc-bar--1 path { stroke: var(--brand-mahogany); }
.xc-bar--1 .xc-bar__tint { fill: var(--brand-rose); opacity: 0.22; }
.xc-bar--2 path { stroke: var(--brand-steel-deep); }
.xc-bar--2 .xc-bar__tint { fill: var(--brand-sky-light); opacity: 0.5; }
.xc-bar--3 path { stroke: var(--brand-sky); }
.xc-bar--3 .xc-bar__tint { fill: var(--brand-sky-pale); opacity: 0.7; }
.xc-bar { clip-path: inset(0 100% 0 0); animation: xc-wipe 1400ms var(--ease-settle) forwards; animation-delay: var(--d, 300ms); }

/* Hero */
.xc-hero { position: relative; overflow: hidden; min-height: 780px; display: flex; align-items: center; background: var(--surface); }
.xc-hero__text { position: relative; z-index: 1; max-width: 540px; padding: var(--space-8) 0; }
.xc-hero__title { margin: var(--space-3) 0 0; color: var(--ink); text-wrap: balance; }
.xc-hero__lead { margin: var(--space-5) 0 0; color: var(--ink-secondary); text-wrap: pretty; }

/* Proof strip */
.xc-proof { position: relative; z-index: 1; border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); background: var(--surface); }
.xc-proof__row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.xc-proof__item { position: relative; display: grid; gap: 6px; padding: var(--space-6) var(--space-5) var(--space-5) 0; }
.xc-proof__item::before { content: ""; position: absolute; top: -1px; left: 0; width: 40px; height: 3px; background: var(--mark, var(--brand-mahogany)); }
.xc-proof__item + .xc-proof__item { padding-left: var(--space-5); border-left: 1px solid var(--hairline); }
.xc-proof__item + .xc-proof__item::before { left: var(--space-5); }
.xc-proof__t { margin: 0; color: var(--ink); font: 600 16px/24px var(--font-sans); }
.xc-proof__b { margin: 0; color: var(--ink-secondary); font: 400 14px/22px var(--font-sans); }

/* Problem and answer */
.xc-pa { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); align-items: start; }
.xc-pa__head { grid-column: 1 / span 4; position: sticky; top: calc(var(--nav-height) + var(--space-6)); }
.xc-pa__table { grid-column: 6 / span 7; }
.xc-pa__cols { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--space-6); padding-bottom: var(--space-3); border-bottom: 2px solid var(--ink); }
.xc-pa__row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--space-6); padding: var(--space-5) 0; border-bottom: 1px solid var(--hairline); }
.xc-pa__t { margin: 0; color: var(--ink); font: 600 18px/26px var(--font-display); }
.xc-pa__b { margin: 6px 0 0; color: var(--ink-secondary); font: 400 15px/24px var(--font-sans); }
.xc-pa__a { position: relative; margin: 0; padding-left: 20px; color: var(--ink); font: 500 15px/24px var(--font-sans); }
.xc-pa__a::before { content: ""; position: absolute; left: 0; top: 11px; width: 12px; height: 2px; background: var(--brand-mahogany); }

/* Built in layers: the Mesa mark as the system diagram */
.xc-stack { position: relative; max-width: 1080px; margin: var(--space-8) auto 0; }
.xc-stack__art { display: block; width: 100%; height: auto; overflow: visible; }
.xc-ground { stroke: var(--border-control); stroke-width: 1; vector-effect: non-scaling-stroke; }
.xc-layer { transition: opacity 400ms var(--ease-standard), transform 600ms var(--ease-settle); transform-box: fill-box; }
.xc-layer__fill { stroke: none; }
.xc-layer__hatch { fill: none; stroke: #ffffff; stroke-width: 1; opacity: 0.28; vector-effect: non-scaling-stroke; }
.xc-layer--1 .xc-layer__fill { fill: var(--brand-mahogany); }
.xc-layer--2 .xc-layer__fill { fill: var(--brand-sky); }
.xc-layer--3 .xc-layer__fill { fill: var(--brand-sky-light); }
.xc-layer--4 .xc-layer__fill { fill: var(--brand-stone); }
.xc-layer--1 .xc-layer__hatch { opacity: 0.16; }
.xc-stack__labels { position: absolute; inset: 0; list-style: none; margin: 0; padding: 0; pointer-events: none; }
.xc-stack__labels li { position: absolute; left: 50%; width: 46%; transform: translate(-50%, -50%); pointer-events: auto; }
.xc-tag { display: grid; justify-items: center; gap: 2px; width: 100%; min-height: 44px; padding: 6px 12px; border: 0; border-radius: var(--radius-md); background: transparent; text-align: center; font: inherit; cursor: default; }
.xc-tag:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.xc-tag__n { font: 600 22px/28px var(--font-display); letter-spacing: -0.01em; }
.xc-tag__b { font: 400 15px/22px var(--font-sans); text-wrap: balance; }
.xc-tag--1 { color: var(--on-accent-surface); }
.xc-tag--1 .xc-tag__b { color: var(--on-accent-muted); }
.xc-tag--2, .xc-tag--3, .xc-tag--4 { color: #211816; }
.xc-tag--2 .xc-tag__b, .xc-tag--3 .xc-tag__b, .xc-tag--4 .xc-tag__b { color: #3a3330; }
.xc-stack__notes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-6); max-width: 1080px; margin: var(--space-7) auto 0; }
.xc-note { margin: 0; padding-left: 14px; border-left: 2px solid var(--mark, var(--brand-mahogany)); color: var(--ink-secondary); font: 400 15px/24px var(--font-sans); }
.xc-stack:has(.xc-tag:is(:hover, :focus)) .xc-layer { opacity: 0.3; }
.xc-stack:has(.xc-tag--1:is(:hover, :focus)) .xc-layer--1,
.xc-stack:has(.xc-tag--2:is(:hover, :focus)) .xc-layer--2,
.xc-stack:has(.xc-tag--3:is(:hover, :focus)) .xc-layer--3,
.xc-stack:has(.xc-tag--4:is(:hover, :focus)) .xc-layer--4 { opacity: 1; transform: translateY(-6px); }
.xc-stack__list { display: none; }

/* How it works */
.xc-steps { position: relative; margin-top: var(--space-8); }
.xc-steps__rule { position: absolute; left: 12px; right: 0; top: 23px; height: 1px; background: var(--border-control); transform-origin: left; }
.xc-steps__list { position: relative; list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-6); }
.xc-step { display: grid; justify-items: start; gap: var(--space-3); padding-top: 12px; }
.xc-step__node { width: 24px; height: 24px; border-radius: 6px; border: 2px solid var(--surface); box-shadow: 0 0 0 1px var(--ring, var(--node, var(--brand-mahogany))); background: var(--node, var(--brand-mahogany)); box-sizing: border-box; }
.xc-sec--canvas .xc-step__node { border-color: var(--canvas); }
.xc-step__n { color: var(--ink-muted); font: 600 12px/16px var(--font-sans); letter-spacing: 0.14em; font-variant-numeric: tabular-nums; }
.xc-step__t { margin: 0; color: var(--ink); font: 600 22px/28px var(--font-display); }
.xc-step__b { margin: 0; color: var(--ink-secondary); font: 400 15px/24px var(--font-sans); }
.xc-practice { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); align-items: center; margin-top: var(--space-9); }
.xc-practice__ui { grid-column: 1 / span 7; }
.xc-practice__text { grid-column: 9 / span 4; }
.xc-practice__list { list-style: none; margin: var(--space-5) 0 0; padding: 0; counter-reset: p; }
.xc-practice__list li { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: 8px; padding: 12px 0; border-top: 1px solid var(--hairline); color: var(--ink); font: 400 15px/24px var(--font-sans); }
.xc-practice__list li::before { counter-increment: p; content: counter(p, decimal-leading-zero); color: var(--accent); font: 600 12px/24px var(--font-sans); letter-spacing: 0.1em; }

/* Governance */
.xc-gov { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); align-items: center; }
.xc-gov__text { grid-column: 1 / span 4; }
.xc-gov__ui { grid-column: 6 / span 7; }
.xc-gov__stat { margin-top: var(--space-6); padding-top: var(--space-5); border-top: 1px solid var(--hairline); }
.xc-list { list-style: none; margin: var(--space-5) 0 0; padding: 0; }
.xc-list li { position: relative; padding: 12px 0 12px 22px; border-top: 1px solid var(--hairline); color: var(--ink); font: 400 15px/24px var(--font-sans); }
.xc-list li::before { content: ""; position: absolute; left: 0; top: 23px; width: 12px; height: 2px; background: var(--brand-mahogany); }
.xc-gov__link { margin-top: var(--space-5); }

/* Who it is for */
.xc-who { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-6); margin-top: var(--space-8); }
.xc-firm { display: flex; flex-direction: column; gap: var(--space-3); padding-top: var(--space-5); border-top: 3px solid var(--mark, var(--ink)); }
.xc-firm__top { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.xc-firm__top img { width: 28px; height: 28px; }
.xc-firm__t { margin: var(--space-2) 0 0; color: var(--ink); font: 600 24px/32px var(--font-display); }
.xc-firm__b { margin: 0; color: var(--ink-secondary); font: 400 15px/24px var(--font-sans); }
.xc-firm__tasks { list-style: none; margin: var(--space-2) 0 0; padding: 0; }
.xc-firm__tasks li { padding: 10px 0; border-top: 1px solid var(--hairline); color: var(--ink); font: 500 14px/22px var(--font-sans); }

/* Founder note on ink */
.xc-ink { position: relative; overflow: hidden; padding: var(--space-10) 0; background: var(--surface-ink); color: var(--on-ink); }
.xc-ink__text { position: relative; z-index: 1; max-width: 640px; }
.xc-ink__note { margin: var(--space-5) 0 0; color: var(--on-ink); font-weight: 500; text-wrap: pretty; }
.xc-ink__by { margin: var(--space-6) 0 var(--space-5); padding-top: var(--space-5); border-top: 1px solid color-mix(in srgb, var(--on-ink) 16%, transparent); color: var(--on-ink-muted); }
.xc-ink .xc-mark { width: 600px; height: 427px; right: -120px; }
.xc-ink .xc-bar--1 path { stroke: var(--brand-rose); }
.xc-ink .xc-bar--1 .xc-bar__tint { fill: var(--brand-mahogany); opacity: 0.5; }
.xc-ink .xc-bar--2 path { stroke: var(--brand-sky); }
.xc-ink .xc-bar--2 .xc-bar__tint { fill: var(--brand-steel-deep); opacity: 0.35; }
.xc-ink .xc-bar--3 path { stroke: var(--brand-steel); }
.xc-ink .xc-bar--3 .xc-bar__tint { fill: var(--brand-steel); opacity: 0.15; }

/* Closing */
.xc-close { position: relative; overflow: hidden; min-height: 560px; display: flex; align-items: center; background: var(--surface); border-top: 1px solid var(--hairline); }
.xc-close__text { position: relative; z-index: 1; max-width: 600px; padding: var(--space-9) 0; }
.xc-close__title { margin: var(--space-3) 0 0; color: var(--ink); text-wrap: balance; }
.xc-close__body { margin: var(--space-4) 0 0; color: var(--ink-secondary); }
.xc-close .xc-mark { width: 720px; height: 512px; right: -160px; }

@keyframes xc-in { from { opacity: 0; translate: 0 16px; } to { opacity: 1; translate: 0 0; } }
@keyframes xc-wipe { to { clip-path: inset(0 0 0 0); } }
@keyframes xc-slide-r { to { translate: 48px 0; } }
@keyframes xc-slide-l { to { translate: -48px 0; } }
@keyframes xc-rule { from { transform: scaleX(0); } to { transform: scaleX(1); } }
@keyframes xc-rise { from { opacity: 0; translate: 0 20px; } to { opacity: 1; translate: 0 0; } }
@keyframes xc-settle { from { opacity: 0; translate: 0 40px; } to { opacity: 1; translate: 0 0; } }

/* Scroll: the bars slide apart along their offset, the step rule draws, layers settle from the base up. */
@supports (animation-timeline: scroll()) {
  @media (prefers-reduced-motion: no-preference) {
    .xc-hero .xc-mark__top { animation: xc-slide-r linear both; animation-timeline: scroll(); animation-range: 0 600px; }
    .xc-hero .xc-mark__bottom { animation: xc-slide-l linear both; animation-timeline: scroll(); animation-range: 0 600px; }
    .xc-steps__rule { animation: xc-rule linear both; animation-timeline: view(); animation-range: entry 40% cover 50%; }
    .xc-pa__row, .xc-firm, .xc-proof__item { animation: xc-rise linear both; animation-timeline: view(); animation-range: entry 0% entry 70%; }
    .xc-layer { animation: xc-settle linear both; animation-timeline: view(); animation-range: entry calc(5% + var(--k, 0) * 9%) cover calc(25% + var(--k, 0) * 9%); }
  }
}
@media (prefers-reduced-motion: reduce) {
  .xc-bar { animation: none; clip-path: none; }
  .xc-fade { animation: none; opacity: 1; }
}

@media (max-width: 1100px) {
  .xc-hero .xc-mark { right: -260px; opacity: 0.6; }
}
@media (max-width: 960px) {
  .xc-head > div, .xc-head > p, .xc-pa__head, .xc-pa__table, .xc-gov__ui, .xc-gov__text, .xc-practice__ui, .xc-practice__text { grid-column: 1 / -1; }
  .xc-head > p { margin-top: var(--space-4); }
  .xc-hero { flex-direction: column; align-items: stretch; min-height: 0; }
  .xc-hero .xc-mark { order: 2; position: relative; top: auto; right: auto; transform: none; width: 100%; height: auto; opacity: 1; margin: 0 0 var(--space-7) 12%; }
  .xc-pa__head { position: static; margin-bottom: var(--space-6); }
  .xc-gov__ui, .xc-practice__text { margin-top: var(--space-7); }
  .xc-proof__row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .xc-proof__item:nth-child(3) { padding-left: 0; border-left: 0; }
  .xc-proof__item:nth-child(3)::before { left: 0; }
  .xc-proof__item:nth-child(n+3) { border-top: 1px solid var(--hairline); }
  .xc-steps__list, .xc-who { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .xc-steps__rule { display: none; }
  .xc-stack__labels { display: none; }
  .xc-stack__list { display: grid; list-style: none; margin: var(--space-5) 0 0; padding: 0; }
  .xc-stack__list li { display: grid; grid-template-columns: 14px minmax(0, 1fr); gap: 12px; padding: 12px 0; border-top: 1px solid var(--hairline); }
  .xc-key { width: 14px; height: 14px; margin-top: 5px; border-radius: 3px; }
  .xc-stack__notes { grid-template-columns: 1fr; }
  .xc-ink .xc-mark, .xc-close .xc-mark { opacity: 0.35; }
}
@media (max-width: 767px) {
  .xc-wrap { padding: 0 var(--page-margin-mobile); }
  .xc-sec, .xc-ink { padding: var(--space-8) 0; }
  .xc-proof__row, .xc-steps__list, .xc-who, .xc-pa__cols, .xc-pa__row { grid-template-columns: 1fr; }
  .xc-proof__item + .xc-proof__item { padding-left: 0; border-left: 0; border-top: 1px solid var(--hairline); }
  .xc-proof__item + .xc-proof__item::before { left: 0; }
  .xc-pa__cols { display: none; }
  .xc-pa__row { gap: var(--space-3); }
}